ok, I'm going to be needing a set of valve springs, and some high strength retainers. I know the stock spring diamater is 1.335 for a 200 and 1.585 closed height. I know I want to maintain the same closed height, but how do I determine what that will be? I know I want a spring with 100 # closed preassure, stock is 52 #, but under boost, I don't want any valves floating. what should I get for valve springs? cam will have .495 lift, so stock valves are useless anyway, they coil bind at .450.